How do you flirt with drunk girls. lol.

They seem pretty empty headed/aloof when drunk, have a terrible sense of humor, never understand wtf I'm saying. They just sit there nod their head and smile/laugh... that doesn't seem like a legit response, more automated than anything.

My favorite way of flirting is to buy them a drink, and before I give it to them I give them a hug while holding said drink, then I slip a little bit of my special medicine into the drink behind their back.